According to a study by the University of Chicago on the physiological needs of men by age, at the age of 55, men expect to be able to prolong their sex life by 15 years. For women, this time will be less than 11 years. In fact, a healthy man's sex life at the age of 55 can extend by 5-7 years, and for women, this number is about 3-5 years less.